Electric overhead trolley conveyor

Abstract

A lower chord electric trolley conveyor comprising a rail with an upper flange which is directly connected to a support structure. The electric trolley receives its current from a bus bar attached to the rail. The drive wheels of the trolley engage the upper side of the lower flange of the rail. Upper flanges extend from a vertical web of the rail toward both sides while a lower flange extends only toward one side. The electric trollery wraps around the lower part of the rail. It comprises counter pressure rolls in front of and behind the drive wheel. The counter pressure rolls engage the surface of the upper flange which faces the lower flange. Several support rolls engage both sides of the vertical web of the rail. The bus bar is connected to the side of the vertical web of the rail facing away from the drive wheel.

I claim: 
     
       1. A lower chord electric trolley conveyor comprising a rail having a vertical web and upper and lower flanges extending therefrom, said upper flange being directly connected to a support structure, and an electric trolley having a drive wheel engaging the upper surface of the lower flange of the rail and receiving current from a bus bar carried by the rail, characterized in that said upper flange extends from the vertical web of the rail from both sides while the lower flange extends only from one side, that the electric trolley wraps around the lower part of the rail and includes counter pressure rolls preceding and following the drive wheel in relation to the direction of movement of the trolley, said counter pressure rolls engaging the surface of the upper flange facing the lower flange, that support rolls carried by the trolley engage both sides of the vertical web of the rail, and that the bus bar is attached to the side of the vertical web of the rail facing away from the drive wheel. 
     
     
       2. Trolley conveyor according to claim 1, characterized in that preceding and following the drive wheel there is provided a roll support block, each of said blocks supporting a counter pressure roll and two support rolls, and said trolley further includes spring means pushing said blocks toward the vertical web of the rail. 
     
     
       3. Trolley conveyor according to one of claims 1 or 2, characterized in that the bus bar is provided above the support rolls at the side of the rail facing away from the drive wheel.